Sealing cover and molding method thereof

ABSTRACT

Provided is a molding method of a sealing cover, realized by setting up a sealing cover mold, the mold includes a cavity and a core group arranged in the cavity, including setting up a first core and a second core, the mold opening direction of the first core and the second core are not parallel. The present application does not need a process hole to perform the injection molding of the sealing cover with a fastening structure, whose sealing is also better.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to PCT/CN2021/080015, having a filingdate of Mar. 10, 2021, which claims priority to Chinese PatentApplication No. 202010812114.1, having a filing date Aug. 13, 2020, theentire contents both of which are hereby incorporated by reference.

FIELD OF TECHNOLOGY

The following application relates to the field of sealing covers, inparticular to a sealing cover and a molding method thereof.

BACKGROUND

Compressors which are used to convert low-pressure gases intohigh-pressure gases have been widely applied to refrigeration equipmentsuch as air conditioners and refrigerators. A compressor is usuallyprovided with terminal posts on its top, through which the compressor isconnected to an external power source for its power supply. Whenconnecting to an external power source, wiring terminals are generallyused to clamp terminal posts for electrical connection. If there ismoisture, water seepage, etc. at the connection between terminal postsand wiring terminals, it will cause leakage, short circuit, etc.Therefore, the sealability between terminal posts and wiring terminalsis required to be high. A sealing cover is needed to sleeve theconnection between terminal posts and wiring terminals. Duringinstallation, the sealing cover is sheathed on the terminal fixing baseof the compressor to be fastened on the top of the compressor.

Chinese Publication No. CN208723128U discloses a sealing cover 1 and awiring terminal 2. Referring to FIG. 1 , the sealing cover 1 includes atop cover 11, a side wall 12, a bottom plate 13 and side plates (notlabelled), wherein the side wall 12 surrounds the top cover 11 and formsa half-surrounded space with an opening at one side. The bottom plate 13is arranged in the half-surrounded space and fixed on the side wall 12.The side of the bottom plate 13 facing the top cover 11, the top cover11 and the side wall 12 together form the wire fixing part (notlabelled) to accommodate wiring terminals 2; the side of the bottomplate 13 facing away from the top cover 11 and the side wall 12 togetherform the fitting space (not labelled) to mount the sealing cover 1 onthe terminal post fixing base (not shown). In the wire fixing part, theside wall 12 is provided with a wire guide port 121, which the wiringterminals 2 can penetrate to enter the wire fixing part. The side platesare arranged in the wire fixing part and fixed between the top cover 11and the bottom plate 13. Guide holes 131 are provided on the bottomplate 13 to communicate the wire fixing part and the fitting space, sothat the terminal posts (not shown) of the compressor can penetrate theguide holes 131 from the fitting space to enter the wire fixing part. Toprevent the wiring terminals 2 from disengaging, the top cover 11 isprovided with positioning parts 100 facing the side plates of the bottomplate 13, which extend from the wire guide port 121 on the top cover 11,along the insertion direction of the wiring terminals 2. Each of thepositioning parts 100 is provided with a limiting plate 101 facing thebottom plate 13 and a vertical plate 102 perpendicular to the top cover11. The distance between the limiting plate 101 of the positioning parts100 and the top cover 11 increases gradually along the insertiondirection of the wiring terminals 2, i.e., the positioning part 100inclines towards the bottom plate 13. The vertical plate 102 is locatedat the end away from the wire guide port 121 and is connected betweenthe top cover 11 and the limiting plate 101.

Moreover, the sealing cover 1 is integrally formed by injection molding.Affected by the molding die, a process hole 122 is required to provideon the side wall 12, through which the wire fixing part is communicatedwith the outside of the sealing cover, and the process hole 122 isdirectly opposite to the wire guide port 121. In an embodiment, theextending direction of the process hole 122 is perpendicular to thevertical plate 102. During injection molding, two cores are insertedfrom the wire guide port 121 and the process hole 122 respectively, theplane of the vertical plate 102 is used as the parting plane, and thedirection perpendicular to the vertical plate 102 is used as the moldopening direction. The molding is performed in such a way that thesealing cover 1 is molded by two cores whose mold opening directions areparallel to each other.

Referring to FIG. 2 , each of the wiring terminals 2 inserted into thesealing cover 1 includes a lead wire fixing base 21, a resilient latch22 and two symmetrically disposed clamping pieces 23, and the lead wirefixing base 21 is provided with an upper end surface 211 and a lower endsurface 212 which is parallel to each other. The two clamping pieces 23are oppositely connected between the upper end surface 211 and the lowerend surface 212 and form an accommodating space for terminal posts. Theresilient latch 22 is made of elastic material, and is provided with afixed end 221 and a movable end 222. The fixed end 221 is fixed on theupper end surface 211, and the movable end 222 rotates with the fixedend 221 as a fulcrum to be away from or close to the upper end surface211. When the wiring terminal 2 is inserted into the wire fixing part ofthe sealing cover 1, the lower end surface 212 contacts with the bottomplate 13 of the sealing cover 1, the upper end surface 211 faces the topcover 11, the fixed end 221 is located at the side away from the wireguide port 121, and the movable end 222 is located at the side close tothe wire guide port 121.

When in use, the wiring terminal 2 is being inserted into the sealingcover 1 from the wire guide port 121 until the movable end 222 passesthrough the vertical plate 102, and the movable end 222 is resisted bythe vertical plate 102 so that the Snap-fit structure prevents thewiring terminal 2 from moving towards the wire guide port 121.Afterwards, the sealing cover 1 and the wiring terminal 2 form an uppercover assembly (not shown). The fitting space of the sealing cover 1covers the terminal posts of the compressor, and the terminal posts arelocated between the two clamping pieces 23. Finally, a sealant isinjected into the wire fixing part, the process hole 122 and thecontacting area of the sealing cover 1 and the terminal post fixing basefor sealing.

It can be seen from the above-mentioned sealing cover that in theconventional art, it is necessary to provide a fastening structurebetween a wiring terminal and a sealing cover, so that the wiringterminal does not easily disengage from the terminal sealing cover.However, the existing fastening structure often needs to provide aprocess hole for the mold core to enter and exit during injectionmolding. Meanwhile, a large amount of sealant needs to be injected intothe process hole when filling the sealant. If insufficient sealant isfilled, it will affect sealing. In addition, the inclined limiting plateand the upper end surface of the wiring terminal form an angle, whichcauses the wiring terminal to easily disengage and the sealant notcompletely filled, which further affects sealing.

SUMMARY

An aspect relates to a sealing cover without any process hole.

The technology solutions of the present application are as following:

The present application relating to a sealing cover includes a topcover, a side wall, a bottom plate and side plates; the side wallsurrounds one side of the top cover and forms a half-surrounded space;the bottom plate is arranged in the half-surrounded space and fixed onthe side wall; the side of the bottom plate facing the top cover, thetop cover and the side wall together form wire fixing part, and the sideof the bottom plate facing away from the top cover and the side walltogether form fitting space; the side plates are arranged in the wirefixing part and fixed between the top cover and the bottom plate; guidehole is provided on the bottom plate to communicate the wire fixing partand the fitting space; blind hole is provided at the inner side of thetop cover in the wire fixing part with the same axis of the guide hole,and projected along the axis, the sectional shape of the blind hole andthe guide hole are the same.

The sealing cover of the present application does not require a processhole provided on the sealing cover, which improves sealing, reducessealant filling, and saves costs. Moreover, it improves productionefficiency to save the process of filling the process hole with sealant.In some embodiments, the inner side of the top cover in the wire fixingpart is parallel to the bottom plate. After the wiring terminal isinserted into the sealing cover, the gap between the top cover and thewiring terminal is uniform, which benefits sealant filling and enhancessealing.

In some embodiments, the side wall in the wire fixing part is providedwith a wire guide port; the inner side of the top cover in the wiringfixing part is further provided with limiting plate, which protrudestowards the bottom plate; the limiting plate is located between theblind hole and the wire guide port. The limiting plate can furtherprevent the wiring terminals from disengaging. In some embodiments, apositioning plate disposed in the wiring fixing part is furtherprovided.

The positioning plate is connected between the top cover and the bottomplate, and the blind hole is located between the positioning plate andthe wire guide port. When the wiring terminal is inserted into thesealing cover, the wiring terminal is positioned by the positioningplate. In some embodiments, the axis of the guide hole is perpendicularto the bottom plate.

In some embodiments, the number of the side plates is at least two andthe side plates are mutually parallel to each other. The adjacent sideplates, the bottom plate and the top cover together form a wiring space;each wiring space is provided with a guide hole and a blind holeopposing to the guide hole. A plurality of wiring spaces is provided fora plurality of the terminal posts to insert. In some embodiments,projected along the axial direction of the guide holes, the blind holeis provided with a circular arc portion and a convex portion connectedto one side of the circular arc portion, and the convex portionprotrudes outward along the radial direction of the circular arcportion.

In addition, the present application also provides a molding method of asealing cover.

The molding method is realized by setting up a sealing cover mold with acavity and a core group arranged in the cavity, which comprises stepsof:

-   -   Setting up a first core; the first core comprises a molding        base, a molding column and a cover molding block; the molding        column and the cover molding block are arranged on the same end        surface of the molding base, the height of the cover molding        block is smaller than that of the molding column, and the cover        molding block surrounds three sides of the molding column; the        mold opening direction of the first core is parallel to the        axial direction of the molding column;    -   Setting up a second core; the second core comprises a wire        insertion space molding block and a through hole penetrating the        wire insertion space molding block, and the sectional shape of        the through holes projected along the axis of the through hole        is the same as the sectional shapes of the molding column along        the axis of the molding column; the mold opening direction of        the second core is not parallel to the axis of the through hole;    -   Inserting the molding column of the first core into the through        holes of the second core to form a core group; the wire        insertion space molding block fits the cover molding block and        one end surface extends outside the molding base;    -   Setting a cavity and put the core group into the cavity to        perform injection molding of the sealing cover; a gap is formed        between the molding base and the wire insertion space molding        block, and the molding column is exposed outside the wire        insertion space molding block;    -   Removing the first core from the sealing cover in a direction        parallel to the axis of the molding column;    -   Removing the second core from the sealing cover in the mold        opening direction thereof after the first core is removed from        the sealing cover.

Compared with the conventional art, the molding method of the sealingcover does not need a process hole to perform the injection molding ofthe sealing cover with a fastening structure, whose sealing is alsobetter.

In some embodiments, the axis of the molding column is perpendicular tothe end surface of the molding base connected thereto.

In some embodiments, in the wire insertion space molding block, both endsurfaces penetrated by the through holes are parallel to the end surfaceof the molding base where the molding column is located. The top coverof the obtained sealing cover is parallel to the end surface of thewiring terminal.

In some embodiments, after setting up the core group, in the wireinsertion space molding block of the second core, the end surfaceoutside the molding base is the outer end surface, and the end surfaceparallel to and directly opposite to the outer end surface is the innerend surface; there is a gap between the inner end surface and the covermolding block of the first core. The obtained sealing cover includes apositioning plate.

In some embodiments, when setting up the core group, projected along theaxis direction of the molding column, the molding column is providedwith arc molding portion and convex molding portion connected to oneside of the arc molding portion, and the convex molding portionprotrudes outward along the radial direction of the arc molding portion.

BRIEF DESCRIPTION

Some of the embodiments will be described in detail, with reference tothe following figures, wherein like designations denote like members,wherein:

FIG. 1 is a side sectional view of a sealing cover in the conventionalart;

FIG. 2 is a structural view of a wiring terminal in the conventionalart;

FIG. 3 is an overall structural view of a sealing cover in someembodiments of the present application;

FIG. 4 is a sectional view along A-A of a sealing cover in someembodiments of the present application;

FIG. 5 is a sectional view along direction B shown in FIG. 4 in someembodiments of the present application;

FIG. 6 is a sectional structural view along A-A shown in FIG. 3 of anupper cover assembly in some embodiments of the present application;

FIG. 7 is a side sectional view of an upper cover assembly used in acompressor in some embodiments of the present application;

FIG. 8 is a structural view of a core group used for molding a sealingcover in some embodiments of the present application;

FIG. 9 is an installation diagram of a core group in some embodiments ofthe present application;

FIG. 10 is a sectional structural view along A-A of a molding die insome embodiments of the present application.

DETAILED DESCRIPTION

Referring to FIG. 3-5 , a sealing cover 1 of some embodiments of thepresent application includes a top cover 11, a side wall 12, a bottomplate 13 and side plates 14, wherein the side wall 12 surrounds the topcover 11 and forms a half-surrounded space with an opening at one side.The bottom plate 13 is arranged in the half-surrounded space and fixedon the side wall 12. The side of the bottom plate 13 facing the topcover 11, the top cover 11 and the side wall 12 together form the wirefixing part (not labelled) to accommodate wiring terminals 2; the sideof the bottom plate 13 facing away from the top cover 11 and the sidewall 12 together form the fitting space (not labelled) to mount thesealing cover 1 on the terminal post fixing base (not shown). In thewire fixing part, the side wall 12 is provided with a wire guide port121, which the wiring terminals 2 can penetrate to enter the wire fixingpart. The side plates 14 are arranged in the wire fixing part and fixedbetween the top cover 11 and the bottom plate 13. Guide holes 131 areprovided on the bottom plate 13 to communicate the wire fixing part andthe fitting space, so that the terminal posts (not shown) of thecompressor can penetrate the guide holes 131 from the fitting space toenter the wire fixing part. Blind holes 111 are provided at the innerside of the top cover 11 in the wire fixing part with openings facingthe bottom plate 13. The blind holes 111 have the same axes with theguide holes 131, and projected along the axes, the sectional shapes ofthe blind holes and the guide holes 131 are the same. In the presentembodiment, projected along the axial direction of the guide holes 131,the openings of the guide holes 131 towards the fitting space arecircular, while the openings of the guide holes 131 towards the wirefixing part have the same sectional shapes as those of the blind holes111. Each of the blind holes 111 is provided with a circular arc portion1111 and a convex portion 1112 connected to one side of the circular arcportion 1111, and the convex portion 1112 protrudes outward along theradial direction of the circular arc portion 1111. In an embodiment, theprotrusion 1112 protrudes towards the wire guide port 121. After theterminal posts are inserted into the sealing cover 1, the terminal postsare located in the blind holes 111. In an embodiment, the axes of theterminal posts and the blind holes 111 are all perpendicular to thebottom plate 13.

In some embodiments, the number of the side plates 14 is more than two.A plurality of mutually parallel side plates 14 are connected betweenthe bottom plate 13 and the top cover 11, and the adjacent side plates14, the bottom plate 13, and the top cover 11 together form a wiringspace. Each wiring space is provided with a guide hole and a blind holeopposing to the guide hole, so as to divide the wire fixing part into aplurality of wiring spaces according to the number of the terminalposts. In the present embodiment, the number of terminal posts on theterminal post fixing base is three, and the wire fixing part is dividedinto three wiring spaces by two side plates 14. Correspondingly, eachwiring space is provided one blind hole 111 and one guide hole 131, thatis, the number of the blind holes 111 and the guide holes 131 is three.

In some embodiments, in order to make the upper end surface 211 of thewiring terminal 2 fitting the sealing cover 1 better, the inner side ofthe top cover 11 in the wire fixing part is parallel to the bottom plate13; the distance from the top cover 11 to the bottom plate 13 is equalto the distance from the upper end surface 211 to the lower end surface212 of the wiring terminal 2, and is smaller than the distance from themovable end 222 to the lower end surface 212. After the wiring terminal2 is inserted into the sealing cover 1, the upper end surface 211 andthe lower end surface 212 of the wiring terminal 2 are in close contactwith the top cover 11 and the bottom plate 13 respectively to preventthe wiring terminal 2 from disengaging.

In some embodiments, the top cover 11 is further provided with limitingplates 112 at the inner side of the wiring fixing part, which protrudetowards the bottom plate 13, and are located between the blind holes 111and the wire guide port 121. When the wiring terminal 2 is beinginserted into the sealing cover 1 from the wire guide port 121, theresilient latch 22 of the wiring terminal 2 slides in along the topcover 11; when the resilient latch 22 is reaching the limiting plate112, the limiting plate 112 presses the resilient latch 22 to deformelastically; after the resilient latch 22 passes through the limitingplate 112, the resilient latch 22 rebounds to its original shape; andthe movable end 222 of the resilient latch 22 is resisted by thelimiting plate 112, so that moving of the wiring terminal 2 towards thewire guide port 121 is prevented. The movable end 222 combines with thelimiting plate 112 at the inner side of the top cover 11 to form afastening structure to further prevent the wiring terminal 2 fromdisengaging.

In some embodiments, in order to better position the wiring terminal 2when it is inserted, the sealing cover 1 further includes a positioningplate 15 connected between the top cover 11 and the bottom plate 13, andthe blind holes 111 are located between the positioning plate 15 and thewire guide port 121. When the wiring terminal 2 is inserted into thesealing cover 1 and its side thereof opposite to the wire guide port 121is against the positioning plate 15, the fixed end 221 of the wiringterminal is located at the side of the positioning plate 15, and themovable end 222 is located in the blind hole 111, so as to realize thepositioning of the wiring terminal 2.

Referring to FIG. 6 , the embodiments further provide an upper coverassembly 3. The upper cover assembly 3 comprises a sealing cover 1 andwiring terminals 2 in any embodiments mentioned above. When the wiringterminal 2 is being inserted into the wire fixing part from the wireguide port 121 of the sealing cover 1, the fixed end 221 of the wiringterminal 2 is located at the side away from the wire guide port 121, andits movable end 222 is located at the side close to the wire guide port121. The wiring terminal 2 is being pushed away from the wire guide port121 until its side away from the wire guide port 121 is against thepositioning plate 15. During the movement of the wiring terminal 2, themovable end 222 of the resilient latch 22 passes through the limitingplate 112 with elastic deformation, and restores to its original shapeafter entering the blind hole 111. The movable end 222 of the resilientlatch 22 is resisted by the limiting plate 112, so that separation ofthe wiring terminal 2 from the sealing cover 1 is avoided.

Referring to FIG. 7 , when assembled over a compressor 1000 of theconventional art, the upper cover assembly 3 is mounted on the terminalpost fixing base 1100 with the opening of the fitting space of thesealing cover 1 facing the terminal post fixing base 1100 on thecompressor; meanwhile the terminal post 1200 on the terminal post fixingbase penetrates the guide hole 131 to enter the wire fixing part of thesealing cover 1 to be clamped by the two clamping pieces 23 of thewiring terminal 2. Finally, a sealant is injected into the wire guideport 121 and the contacting area of the sealing cover 1 and the terminalpost fixing base for sealing. Since the distance between the upper endsurface 211 and the top cover 11 is small, only a small amount ofsealant is needed for sealing. Moreover, since the upper end surface 211of the wiring terminal 2 and the top cover 11 are evenly spaced, thesealant is evenly distributed between the wiring terminal and the topcover 11, it is not easy to generate gaps, and thereby the sealing isenhanced. In order to produce the above-mentioned sealing cover 1, amolding method thereof is also provided by the present application. Themolding method of the sealing cover does not require a process hole 122provided on the sealing cover 1. This method adopts the guide hole 131of the sealing cover 1 and two cores whose mold opening directions arenot parallel to each other to perform molding, wherein the mold openingdirection of one core is parallel to the axis of the guide hole.

Referring to FIG. 8 to 10 , the method for molding the sealing cover ofthe present application is realized by setting up a sealing cover mold,which includes a cavity (not shown) and a core group 4. The core group 4includes a first core 41 and a second core 42 whose mold openingdirections are not parallel to each other. And specifically, it includessteps of:

Step S10: Set up a first core 41. The first core 41 comprises a moldingbase 411, a molding column 412 and a cover molding block 413. Themolding column 412 extends from the first end surface 4111 of themolding base 411, and its extending direction is parallel to the moldopening direction of the first core 41. In an embodiment, the axis ofthe molding column 412 is perpendicular to the first end surface 4111.The cover molding block 413 is a convex block fixed on the first endsurface 4111, its second end surface 4131 away from the molding base 411is parallel to the first end surface 4111, the height of the covermolding block 413 relative to the first end surface 4111 is smaller thanthat of the molding column 412 relative to the first end surface 4111,and the cover molding block 413 surrounds three sides of the moldingcolumn 412.

Step S20: Set up a second core 42. The second core 42 comprises a wireinsertion space molding block 421 and through holes 422, and the moldopening direction of the second core 42 is not parallel to the axes ofthe through holes 422; the mold opening direction of the core 42 isperpendicular to the axes of the through holes 422. The extendingdirection of the wire insertion space molding block 421 is the same asthe inserting direction of the wiring terminals 2 to realize the formingof the wire insertion space. The through holes 422 are provided in thewire insertion space molding block 421, and the sectional shapes of thethrough holes 422 projecting along the axes of the through holes 422 arethe same as the sectional shapes of the molding columns 412 projectingalong the axes of the molding columns 412. In an embodiment, the thirdend surface 4211 and the fourth end surface 4212 of the wire insertionspace molding block 421 penetrated by the through holes 422 are parallelto each other; in some embodiments, the third end surface 4211 and thefourth end surface 4212 are both parallel to the first end surface 4111.

Step S30: Insert the molding columns 412 of the first core 41 into thethrough holes 422 of the second core 42 to form a core group 4. In thewire insertion space molding block 421, three of the four end surfacessurrounding the third end surface 4211 and the fourth end surface 4212are in contact with the cover molding block 413, and the rest one endsurface is located outside the 0 molding base 411, which is the outerend surface 4213; the outer end surface 4213 is perpendicular to thefirst end surface 4111. When setting up the core group 4, projectedalong the axis direction of the molding columns 412, the molding columns412 are provided with arc molding portions 4121 and convex moldingportions 4122 connected to one side of the arc molding portions 4121.The convex molding portions 4122 protrude outward along the radialdirection of the arc molding portions 4121, and the convex moldingportions 4122 protrude towards the outer end surface 4213.

Step S40: Put the core group 4 into the matching cavity 5 to performinjection molding of the sealing cover 1. Under the support of thecavity 5, a gap is formed between the wire insertion space molding block421 and the molding base 411, and the molding columns 412 penetrate thethrough holes 422 and are exposed outside the wire insertion spacemolding block 421. In the wire insertion space molding block 421, thethird end surface 4211 is far away from the molding base 411; thedistance from the third end surface 4211 to the first end surface 4111is the same as that from the second end surface 4131 to the first endsurface 4111.

After the second core 42 is inserted into the first core 41, the wireinsertion space molding block 421, the molding base 411, the covermolding block 413 and the cavity 5 together form the top cover 11, theside wall 12, and the side plates 14 of the sealing cover 1; the gapbetween the wire insertion space molding block 421 and the molding base411 and the cavity together form the bottom plate 13. Since the moldingcolumns 412 are disposed on the molding base 411, penetrate the wireinsertion space molding block 421, and are exposed outside the wireinsertion space molding block 421, that is to say, the molding columns412 penetrate the bottom plate 13 and enter the top cover 11, so thatcoaxial guide holes 131 and blind holes 111 are respectively formed onthe bottom plate 131 and the top cover 11.

In some embodiments, in step S30, after setting up the core group 4, inthe wire insertion space molding block 421, the end surface parallel toand directly opposite to the outer end surface 4213 is the inner endsurface 4214, the through holes 422 are located between the outer endsurface 4213 and the inner end surface 4214, and a gap is providedbetween the inner end surface 4214 and the cover molding block 413 toform the positioning plate 15.

According to the number and position of the terminal posts,corresponding molding columns 412 and wire insertion space molding block421 are arranged; the axes of the molding columns 412 are perpendicularto the end surface 4111; after the core group 4 is set up, the third endsurface 4211 and the fourth end surface 4212 are both parallel to thefirst end surface 4111; the inner end surface 4214 is perpendicular tothe first end surface 4111.

Step S50: Remove the first core 41 from the sealing cover 1 along theaxes of the molding columns 412 after the sealing cover 1 is molded.

Step S60: Remove the second core 42 from the sealing cover 1 in adirection parallel to the first end surface 4111 after the first core 41is removed and far away from the sealing cover 1; demolding of thesealing cover 1 is completed.

In summary, during injection molding, the mold opening directions of thefirst core 41 and the second core 42 are not parallel to each other. Inaddition, according to the position relationship between the insertiondirection of the terminals 2 and the terminal posts, the angle betweenthe mold opening direction of the first core 41 and the second core 42is set to any value between 0 degree and less than 90 degrees, so thatthe terminals 2 can be inserted into the sealing cover 1 at differentangles.

Compared with the conventional art, the sealing cover of the presentapplication does not require a process hole provided on the sealingcover, which improves sealing, reduces sealant filling, and saves costs.Moreover, it improves production efficiency to save the process offilling the process hole with sealant. Further, the end surface of thesealing cover in the upper cover assembly is in close contact with thewiring terminal, and a fastening structure is provided to prevent thewiring terminal from disengaging. Moreover, the molding method of thepresent application is provided to produce the above-mentioned sealingcover 1 in injection molding production.

Although the invention has been illustrated and described in greaterdetail with reference to the preferred exemplary embodiment, theinvention is not limited to the examples disclosed, and furthervariations can be inferred by a person skilled in the art, withoutdeparting from the scope of protection of the invention.

For the sake of clarity, it is to be understood that the use of “a” or“an” throughout this application does not exclude a plurality, and“comprising” does not exclude other steps or elements.

1-7. (canceled)
 8. A molding method of a sealing cover, realized bysetting up a sealing cover mold, the mold comprises a cavity and a coregroup arranged in the cavity, wherein comprising: setting up a firstcore; the first core comprises a molding base, a molding column andcover molding block; the molding column and the cover molding block arearranged on the same end surface of the molding base, the height of thecover molding block is smaller than that of the molding column, and thecover molding block surrounds three sides of the molding column; themold opening direction of the first core is parallel to the axialdirection of the molding column; setting up a second core; the secondcore comprises a wire insertion space molding block and a through holepenetrating the wire insertion space molding block, and the sectionalshape of the through holes projected along the axis of the through holeis the same as the sectional shape of the molding column along the axisof the molding column; the mold opening direction of the second core isnot parallel to the axis of the through hole; inserting the moldingcolumn of the first core into the through hole of the second core toform a core group; the wire insertion space molding block fits the covermolding block and one end surface extends outside the molding base;setting a cavity and put the core group into the cavity to performinjection molding of the sealing cover; a gap is formed between themolding base and the wire insertion space molding block, and the moldingcolumn is exposed outside the wire insertion space molding block;removing the first core from the sealing cover in a direction parallelto the axis of the molding column; and removing the second core from thesealing cover in the mold opening direction thereof after the first coreis removed from the sealing cover.
 9. The molding method of a sealingcover of claim 8, wherein the axis of the molding column isperpendicular to the end surface of the molding base connected thereto.10. The molding method of a sealing cover of claim 9, wherein in thewire insertion space molding block, both end surfaces penetrated by thethrough holes are parallel to the end surface of the molding base wherethe molding column is located.
 11. The molding method of a sealing coverof claim 10, wherein after setting up the core group, in the wireinsertion space molding block of the second core, the end surfaceoutside the molding base is the outer end surface, and the end surfaceparallel to and directly opposite to the outer end surface is the innerend surface; there is a gap between the inner end surface and the covermolding block of the first core.
 12. The molding method of a sealingcover of claim 8, wherein when setting up the core group, projectedalong the axis direction of the molding column, the molding column isprovided with arc molding portion and convex molding portion connectedto one side of the arc molding portion, and the convex molding portionprotrudes outward along the radial direction of the arc molding portion.